elf/dl-call_fini.c

   1 /* Invoke DT_FINI and DT_FINI_ARRAY callbacks.
   2    Copyright (C) 1996-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <ldsodefs.h>
  20 #include <sysdep.h>
  21
  22 void
  23 _dl_call_fini (void *closure_map)
  24 {
  25   struct link_map *map = closure_map;
  26
  27   /* When debugging print a message first.  */
  28   if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
  29     _dl_debug_printf ("\ncalling fini: %s [%lu]\n\n", map->l_name, map->l_ns);
  30
  31   /* Make sure nothing happens if we are called twice.  */
  32   map->l_init_called = 0;
  33
  34   ElfW(Dyn) *fini_array = map->l_info[DT_FINI_ARRAY];
  35   if (fini_array != NULL)
  36     {
  37       ElfW(Addr) *array = (ElfW(Addr) *) (map->l_addr
  38                                           + fini_array->d_un.d_ptr);
  39       size_t sz = (map->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
  40                    / sizeof (ElfW(Addr)));
  41
  42       while (sz-- > 0)
  43         ((fini_t) array[sz]) ();
  44     }
  45
  46   /* Next try the old-style destructor.  */
  47   ElfW(Dyn) *fini = map->l_info[DT_FINI];
  48   if (fini != NULL)
  49     DL_CALL_DT_FINI (map, ((void *) map->l_addr + fini->d_un.d_ptr));
  50 }